Biophysics Core The BIOPHYSICS CORE provides specialized equipment and technical expertise for the structural characterization of macromolecules. It enables and assists all members of the Program of Projects in the analysis of complex macromolecular systems by means of Analytical Ultracentrifugation, Circular Dichroism, Fluorescence Spectroscopy and X-ray Diffraction. These techniques provide solution-state and structural information on biological macromolecules and their complexes, such as molecular weight, aggregation state, monodispersity, hydrodynamic properties (size, shape), secondary structure (folding), and interactions (binding energy, rate constants, etc), and streamlines structure determination by x-ray crystellography. In the context of this Program of Projects, these approaches will be applied to study the interaction between histone chaperones, histone acetyltransferases, and other cellular factors, to investigate the enzymatic mechanism of histone acetyl transferase, and to assay the compaction state of chromatin fibers. The Biophysics Core is co-directed by two full-time Ph.D.-level Directors with many years of experience in the use of all listed experimental approaches. The Biophysics Core has the following Specific Aims:
AIM 1 :To use analytical ultracentrifugation to characterize the homogeneity/ aggregation state, shape and size of relevant chromatin-associated proteins.
AIM 2 : To characterize the purity and stoichiometry of protein-complexes using analytical ultra-centrifugation.
AIM 3 : To check the integrity of mutant proteins using circular dichroism.
AIM 4 : To determine the thermodynamic and kinetic parameters for proteins involved in chromatin dynamics using fluorescence spectroscopy.
AIM 5 : To support the determination of three-dimensional macromolecular structures by means of X-ray diffraction experiments and high-resolution native and derivative date collection.
AIM 6 : To provide electronic raw data storage, data processing and interpretation capabilities, including computer hardware and software.
The Biophysics Core provides the instrumentation and expertise for the solution-state analysis of biological macromolecules using state-of-the-art approaches. It also provides the capabilities to crystallize macromolecules and to determine their structure through MIR, MAD, and molecular replacement.
|Chen, Xu; D'Arcy, Sheena; Radebaugh, Catherine A et al. (2016) Histone Chaperone Nap1 Is a Major Regulator of Histone H2A-H2B Dynamics at the Inducible GAL Locus. Mol Cell Biol 36:1287-96|
|White, Alison E; Hieb, Aaron R; Luger, Karolin (2016) A quantitative investigation of linker histone interactions with nucleosomes and chromatin. Sci Rep 6:19122|
|Chatterjee, Nilanjana; North, Justin A; Dechassa, Mekonnen Lemma et al. (2015) Histone Acetylation near the Nucleosome Dyad Axis Enhances Nucleosome Disassembly by RSC and SWI/SNF. Mol Cell Biol 35:4083-92|
|Brehove, Matthew; Wang, Tao; North, Justin et al. (2015) Histone core phosphorylation regulates DNA accessibility. J Biol Chem 290:22612-21|
|Kuo, Yin-Ming; Henry, Ryan A; Huang, Liangqun et al. (2015) Utilizing targeted mass spectrometry to demonstrate Asf1-dependent increases in residue specificity for Rtt109-Vps75 mediated histone acetylation. PLoS One 10:e0118516|
|Mattiroli, Francesca; D'Arcy, Sheena; Luger, Karolin (2015) The right place at the right time: chaperoning core histone variants. EMBO Rep 16:1454-66|
|Groocock, Lynda M; Nie, Minghua; Prudden, John et al. (2014) RNF4 interacts with both SUMO and nucleosomes to promote the DNA damage response. EMBO Rep 15:601-8|
|Muthurajan, Uma M; Hepler, Maggie R D; Hieb, Aaron R et al. (2014) Automodification switches PARP-1 function from chromatin architectural protein to histone chaperone. Proc Natl Acad Sci U S A 111:12752-7|
|Blakeslee, Weston W; Wysoczynski, Christina L; Fritz, Kristofer S et al. (2014) Class I HDAC inhibition stimulates cardiac protein SUMOylation through a post-translational mechanism. Cell Signal 26:2912-20|
|Chodaparambil, Jayanth V; Pate, Kira T; Hepler, Margretta R D et al. (2014) Molecular functions of the TLE tetramerization domain in Wnt target gene repression. EMBO J 33:719-31|
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